add javascript binary search

[gioboa]

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Description 📜

Add binary search algorithm

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Type of change 📝

• [X] Code

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Programming Language

• [X] Javascript

Domain of Contribution 📊

• [X] Algorithms
• [X] Searching

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Checklist ✅

• [X] I follow Contributing Guidelines & Code of conduct of this project.
• [X] I have performed a self-review of my own code or work.
• [X] I have commented my code, particularly in hard-to-understand areas.
• [X] My changes generates no new warnings.

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